Having the same problem, running on Windows 7 here. Tried every single one of those solutions as well, to no avail. If anyone has a solution that does not involve "bcrypt.dll" (which doesn't even exist in the latest version of Frosty), running as administrator or taking full control of the folders, since I've tried all of those, it would be much appreciated. Just like OP, I can launch the game normally, but if I try to use the Mod Manager it just has a process in the Task Manager, but nothing shows up.